Tubing and method of forming the same



July 14, 1931. s. w. TAYLOR TUBING AND METHOD OF FORMING THE SAME Filed July 30, 1928 Patented July 14, 1931 UNITED STATES PATENT orrlcr:

SAMUEL W. TAYLOR, OF DETROIT, MICHIGAN, ASSIGNOR TO COPELAND PRODUCTS INC., A CORPORATION OF MICHIGAN TUBING AND METHOD OF FORMING THE SAME Application filed July 30,

In the making of pipe connections for use in some devices such for instance as refrigerating systems, it is customary to flare the ends of the pipes so that such flared ends may be clamped in suitable fittings. This clamping, owing to the relative thinness of the tubing, oftentimes results in. breaking off of the clamped ends of the tubing.

One of the objects of my invention. is to provide a tubing having a double thickness end or one wherein the ends of the tubing are return bent to form a double thickness. Another object is to provide such a construction in conjunction with a flared end on the tubing.

Another object is to provide simple and eflicient means and methods by which tubing of this character may be economically formed.

With the above and other objects in view, my invention consists in the arrangement, combination and construction of the various parts of my improved device as described in the specification, claimed in my claims and shown in the accompanying drawings, in

which Fig. 1 is a top or plan view of a fixture or die in which tubing to be formed may be placed.

Fig. 2 is a sectional view illustrating a piece of tubing placed in said die in conjunction with a punch positioned ready for the first operation of bending the tubing.

Fig. 3 is a view similar to that in Fig. 2 showing the parts after the punch has served its bending function.

Fig. 4 is a similar View with a second punch shown in position ready for operation.

Fig. 5 is a similar view showing the punch at the conclusion of its operation and showing the tubing in its final finished form.

I have shown a fixture or die comprising two halves 5 and 6. The portion 5 is pro-' vided with a pin 7 to which a bolt 8 may be pivoted, said bolt extending through the portion 6 and having a wing nut 9 on the end thereof.

The die 5 is provided with a plurality of openings 10 to receive different sizes of tub- 1928. Serial No. 296,111.

ing. The two halves 5 and 6 are swung apart on the pivot 7 and a piece of tubing of suitable size is inserted in one of the openings 10. The halves 5 and 6 are then brought together and clamped around the tubing by means of the stud 11 which extends through the portion 6 and is threaded into the portion 5 as at 12. The end of the stud 11 is provided with wings 13 to assist in screwing it into place. The halves 5 and 6 may further be provided with corrugations 14.- to assist in clamping the tubing in place.

The openings 10 in the die are outwardly flared at a point 15 intermediate their ends. When a piece of tubing 16 is inserted in one 5 of the openings as shown in Fig. 2, a punch 17 is-brought to position adjacent the top of the opening. The punch 17 is provided with a tapered opening 18 the outer end of which encloses the outer end of the tubing. This punch is forced downwardly to the position shown in Fig. 3 with the result that the extreme outer end of the tubing 16 is inwardly flared as indicated at 19 and an outwardly flared portion 20 is formed directly adjacent the inwardly flared portion 19, this latter formation being occasioned by the outwardly flared portion 15 in-the die members.

I The punch 17 is then removed and a punch 21 brought to the position shown in Fig. 4. so The punch 21 is provided with a tapered projection 22 which is inserted in the end of the tubing 16 and serves, when the punch is moved downwardly to the position shown in Fig. 5, to return bend the end 19 of the tubing until it overlies the outwardly flared" portion 20, thus forming a double thickness outwardly flared end 23 as indicated in Fig. 5.

It will be readily apparent that-this end will have a great deal more. strength than the single thickness outwardly flared f end and that the construction may be manufactured economically and efficiently.

It will-be obvious that various changes may be made in the arrangement, combination and construction of the various parts of my improved device without departing from the spirit of my invention and it is my intention to cover by my claims such changes as may reasonably be included within the scope thereof.

What I claim is:

1. The method of forming an attaching end portion on an open ended tube which comprises inwardly tapering an end of said tube, then bending said inward taper within the tube to form a double thickness end, and outwardly tapering said end.

2. The method of forming an attaching end portion on an open ended tube which comprises inwardly tapering the extreme end thereof and outwardly tapering the portion adjacent said inward taper, and then bending the inwardly tapered portion on the out-- wardly tapered portion to form a double thickness outwardly tapered end.

3. The method of forming a tube end which comprises clamping the same in a die, striking the end of the tube with a punch to form an inwardly flared portion I and bending said portion inwardly against the body of the tube to form a double thickness end.

'1. The method of forming a tube end which comprises clamping the same in adie, striking the end of the tube with a punch to form an inwardly flared end thereon and an outwardly flared portion adjacent said inward flare, and bending the inwardly flared portion on the outwardly flared portion to form a double thickness outwardly flared end.

5. The method of forming a tube end which comprises clamping the same in a die having an outwardly flared portion, striking the end of the tube with a punch having an outwardly flared portion, whereby the end of the tube will be inwardly flared and the portion adjacent the outward flare of the die will be outwardly flared, and then striking the end of the tube with another punch to bend the inwardly flared end upon the outwardly flared portion.

SAMUEL WV. TAYLOR. 

